Open history version files from Git in Vim via LazyGit

config.yml

# yaml-language-server: $schema=https://json.schemastore.org/lazygit.json
promptToReturnFromSubprocess: false
os:
  editPreset: "nvim"

customCommands:
  - key: E
    context: commitFiles
    subprocess: true
    # - When a file is selected, open the file before the commit
    # - When a directory is selected, open the commit changes limited to that directory
    command: |
      {{if .SelectedCommitFile}}
      git show '{{.SelectedLocalCommit.Sha}}^:{{.SelectedCommitFile.Name}}' |\
      vim -Rm - +"let b:fname = 'file git://{{.SelectedLocalCommit.Sha}}^/{{.SelectedCommitFile.Name}}'" \
      {{else}}
      git show '{{.SelectedLocalCommit.Sha}}' -- git show {{.SelectedCommitFilePath}} |\
      vim -Rm - +"let b:fname = 'file git://{{.SelectedLocalCommit.Sha}}/{{.SelectedCommitFilePath}}.patch'" \
      {{end}}--cmd 'set mls=0' \
             +'nnoremap <buffer> q <Cmd>quit<CR>' \
             +"exec 'file '.fnameescape(b:fname) | unlet b:fname | set mls=5 | silent! filetype detect"

• When choosing a file in the commit pannel: open the file before the changes in that commit in Vim.
• When choosing a directory in the commit pannel: open the patch of that directory in Vim.

The gotchas to open stdin in vim/nvim

• Ignore the modeline errors by ignoring first and running filetype detect with silent!.
• Use fnameescape to escape the file name since Vim tries to expand %, # and other symbols in cmdline.
• -M does not work well with plugin like Telescope.